Mr. Muskrat, thanks. This definitely helped.
But I am not very sure on the coverage by Devel::Cover itself. I have legacy code. For e.g., we use a certain Perl custom-developed package which is basically a wrapper around Perl GetOpt. When I pass an option arg1 = "abc" 1st time, and then arg1="xyz" the 2nd time, and I have code like: if ($run eq "abc") {do_this} else {do_that}.
I expected devel_cover to show me the if-loop covered 1st time. Else-loop uncovered. While vice versa in the 2nd run.
It did not. I hope I am not missing anything.